Just realised I should have responded to this.
Cabin Crew serving Y seemed to be more "gowned up" than those working at the front.
Food was very good with multiple rounds of service for dinner although all served with plastic or foil lids on, which takes the J class edge a bit. By the end of the flight I probably could have opened a profitable e-bay store reselling all the hygiene stuff as every few hours we were given more cleaning wipes.
All told, I was very impressed with my first trip on BR. A couple of things didn't quite go as well as they could (LHR security shunting around 50 passengers into the fast track queue just before I got there and a bit of snagging about lounge access) and i'm still not sold on the colour scheme in the cabin, but I'm happy to overlook that.